Overt Mycobacterium avium subsp. paratuberculosis Infection: An Infrequent Occurrence in Archived Tissue from False TB Reactor Cattle in Michigan, USA

Table 2

Summary of pathology and PCR results in MAP infected animals.

Study group	M. bovis test result	H & E histo. result ileum	Acid -fast result ileum	H & E histo. result lymph node^a	Acid-fast result lymph node^a	MAP PCR	M. avium PCR	Breed	TB status of herd
Group 1	Primary and secondary test positive.	Neg.	Neg.	Neg.	Neg.	Pos.	Neg.	Jersey	Neg.
Group 2	CFT Pos.	Pos.	Pos.	Pos.	Neg.	Pos.	Pos.	Jersey	Pos.
Group 2	CFT Pos.	Pos.	Pos.	Pos.	Neg.	Pos.	Pos.	Holstein	Pos.
Group 2	CFT Pos.	Neg.	Neg.	Neg.	Neg.	Pos.	Neg.	Holstein	Pos.
Group 3	CFT Neg.	Pos.	Pos.	Pos.	Pos.	Pos.	Pos.	Holstein	Neg.
Group 3	CFT Neg.	Neg.	Pos.	Neg.	Neg.	Pos.	Neg.	Holstein	Pos.
Group 3	CFT Neg.	Neg.	Neg.	Neg.	Neg.	Pos.	Neg.	Holstein	Pos.
Group 3	CFT Neg.	Neg.	Neg.	Neg.	Neg.	Pos.	Neg.	Holstein	Pos.

^aLymph node was ileo-cecal lymph node.